/*
 * Copyright (c) 2004, 2006, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 */

package javax.xml.transform;

import java.security.*;
import java.net.*;
import java.io.*;
import java.util.*;

/**
 * This class is duplicated for each JAXP subpackage so keep it in sync.
 * It is package private and therefore is not exposed as part of the JAXP
 * API.
 *
 * Security related methods that only work on J2SE 1.2 and newer.
 */
class SecuritySupport {


  ClassLoader getContextClassLoader() throws SecurityException {
    return (ClassLoader)
        AccessController.doPrivileged(new PrivilegedAction() {
          public Object run() {
            ClassLoader cl = null;
            //try {
            cl = Thread.currentThread().getContextClassLoader();
            //} catch (SecurityException ex) { }
            if (cl == null) {
              cl = ClassLoader.getSystemClassLoader();
            }
            return cl;
          }
        });
  }

  String getSystemProperty(final String propName) {
    return (String)
        AccessController.doPrivileged(new PrivilegedAction() {
          public Object run() {
            return System.getProperty(propName);
          }
        });
  }

  FileInputStream getFileInputStream(final File file)
      throws FileNotFoundException {
    try {
      return (FileInputStream)
          AccessController.doPrivileged(new PrivilegedExceptionAction() {
            public Object run() throws FileNotFoundException {
              return new FileInputStream(file);
            }
          });
    } catch (PrivilegedActionException e) {
      throw (FileNotFoundException) e.getException();
    }
  }

  InputStream getResourceAsStream(final ClassLoader cl,
      final String name) {
    return (InputStream)
        AccessController.doPrivileged(new PrivilegedAction() {
          public Object run() {
            InputStream ris;
            if (cl == null) {
              ris = Object.class.getResourceAsStream(name);
            } else {
              ris = cl.getResourceAsStream(name);
            }
            return ris;
          }
        });
  }

  boolean doesFileExist(final File f) {
    return ((Boolean)
        AccessController.doPrivileged(new PrivilegedAction() {
          public Object run() {
            return new Boolean(f.exists());
          }
        })).booleanValue();
  }

}
